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  kannan narayanan 1 day ago · 4 min read WHY CAN,T YOU UNSCRAMBLE AN EGG? Photo by  Sarah Shull  on  Unsplash VISIT: 'MATH IN ACTION' SITE “ You cannot cool a body cooler than its surroundings” ds is greater than 0 “Energy should be greater than zero”. Disorder should increase. All above are different forms of second law of thermodynamics. Think of Mercides Benz. Its heart is “internal combustion engine”. It works because of second law of thermodynamics. In a cylinder, petrol and air is mixed ; pressed by piston; ignited. The mixture explodes, expands, and pushes the piston. The piston rotates the wheel through the lever and gear arrangement. ROLE OF SECOND LAW IN BENZ The gas mixture expands because the second law says that everything will go into disorder. The explosion insid e  the cylinder is hot and the surrounding is cold. Hence the generated heat can pass outside; the next explosion can take place, and the engine can run. An engine requires a reversible ...